其它常用代码参考

UserAcount = string.Join("，", from t in userInfoAccountList
where t.UserInfoCode == d.UserInfoCode
orderby t.AccountCategory
select t.UserAccount),

OrderStatusCN = orderStatusList.Where(t => t.Value == d.OrderStatus).Select(t => t.Text).FirstOrDefault() ?? "未知",

List<ActivityInfoRewardClass> rewardList = (from d in activityInfoRewardList
where d.PersonCategory == EnumRISPersonCategory.Promoter.ToString()
select d).ToList();

var randomActivityInfoRewardList = activityInfoRewardList.OrderByDescending(t => t.RewardAmount).ToList();

public enum EnumPCSImageCategory
{
IDCardForFront = 0,
IDCardForBack = 1,
IDCardForPerson = 2,
BusinessLicense = 3
}
EnumPCSImageCategory.IDCardForFront.ToString()

ProductItem = (from p in context.Products
join po in context.ProductOrders on p.ProductCode equals po.ProductCode
where po.OrderId == d.Id
orderby p.Id
select p).FirstOrDefault(),